Injector.



J. c.'& R. n; MBTGAL FE. INJECTOR.

APPLIOATIUN FILED 'MAY 10, 1907.

905,206. r Patented Dec. 1, 1908.

4 SHEETSSHEBT W W O THE NORRIS PETERS co., wasmnmmn, n, c.

J; c. 5; R. 1); METGALFE.

' INJEUTOR.

APPLICATION FILED 101110, 1907.

Patented Dec. 1,1908.

4 SHEETS-SHEET 3.

E h L A G T E M D R .& G J

INJECTOR.

APPLIOATION TILED MAY 10, 1907.

Patented Deg. 1,1908.

4 SHEETS-SHEET 4 m an I'm: NORRIS PETERS 60., wnsnmarom'nx.

UNITED STATES? ATE TQFF CE- JAMES OROXON MET ALFE AND RICHARD: DAVID METOALFE, OF'FALLOWFIELD,

. 1 ENGLANDJ. I

mmc'ron.

To all whom it may concern: Belt known that we, JAMES Cnoxon Men oALr-E-and RICHARD DAVID Mn'rchnrn, subjects of the King of Great Britain and Ireland, residing at. Sheen Bank, Lord street,

Fallowfield, in the county of Lancaster,

England, have invented certain new and useful Improvements in Injectors, of which.

the following is a specification.

This invention relates to m ectorsand has for its object to produce an injector capable of dealing with high pressuresteam and ector, but with such injectors -.diificult-y has been experienced owing to the pressure in the overflow chamber breakingthe jet passing through the combining nozzle at its inlet end, and to the overflow valve preventingthat free escape of steam whenthe injector is starting, or when the jet breaks, which is essential to the automatic starting andrestarting of the appliance. The latter defect is due to the steam, when the injector is starting, setting up a pressure in the delivery'chamber of the injectorandso holding the overflow valve onits-seatp The invention comprises the improved combinations and arrangements of parts hereinafter described and claimed whereby the aforesaid defects are overcome. 3

,Referring to the four accompanying sheets of explanatory drawings ;Figure 1 is a part sectional elevation and Fig. :2 a part sectional plan of an injector. constructed in one convenient form according to; our invention. Figs. 3 and l are similar views to Figs. 1 and 2 respectively, showing a modified form of our injector. Figs. 5 and 6 show in. sectional elevations further modi fied forms of our injector.

The same reference letters in the different views indicate the same or similar parts. .In Figs. .1 and 2,0 is the forcing. steam nozzle of the injector, Z) the lifting steam nozzle and 0v the combining" nozzle.- The lifting steam nozzle Z) is so proportioned and arranged with respect to the inlet end of the combining nozzle 0 as to produce a suction action in the feed water pipe mothe well known manner.

wThe entering feed water iscaused tosur- Specification of'Letters Patent. Application filed May 10, 1907. Serial No. 372,951.

Pa.tented Dec. 1, 1908.

ground the steam jet in a thin annular film 'moving with a very high velocity. When the injector is working normally it is found that a vacuum-"orpartial Vacuumexists'at a :point between the ends of the lifting and forcing steam nozzles 72 and a respectively, butthat 'apressure existsbeyond the forcingj steam nozzle. We therefore provide a means of communication m between the interior of the combining nozzle 0 and the overflow chamber at a point between the ends of the lifting and-forcing steam nozzles to allowof the escape of the steam from the lifting nozzle when starting and to permit of the i-ntrodu'ctionof a supplementary supply of water, as hereinafter'described. For preventing: the pressure beyond the forcing nozzle passing by way of the overflow chamher to the inlet end of the combining nozzle where the} slot or gap m is situated and so destroying the vacuum at that point and breaking the jet, we divide the overflow chamber into two independent compartments .f, g, each fitted with its own overflow valve as (Z and erespectively.

. it is the .commonoverflow passage.

hen the steam is of high pressure and the feed water of high temperature, the pres:

- sure in the chamber f rises very considerably,

whilewe find that a very high vacuum exists in thecompartment 9 throughout the normal working 0 the injector. We therefore provide a valve for the compartment f which during the normal working of the injector is loaded, but when the injectoris starting is only partially loaded to permit of the release ofany excesspressure in f. The automatic loading is effected by means of the plunger 2' through the medium of the lever j, the plunger i being acted onby the pressure'in the discharge chamber of the injector. The other compartment, namely 9, is quite unafiected by the conditions existing in the compartment f: and is fitted with a free valve 6 whichcan allowofthe escape ofany pressure which may exist in g, as forexample when the injector is starting though no de- 1 livery is takin place therefrom, or when the jet in the nozz e cbreaks. Such valve c also 'preventsthe inflow of air whenthe injector is working normally and a vacuum exists in g as before described.

By the employment of a free valve on an inde endent compartment. as 9 containing the rst slot or gap m, situated between the ends of the lifting and forcing steam nozzles, the injector is rendered capable of quickly clearing itself of steam for starting and restarting purposes, and the employment of automatic controlling means for the valve (Z and a supplementary water inlet to the compartment g renders the injector capable of automatically dealing with hot feed water and high pressure steam.

We preferably place an ordinary opening flap n on a portion of the combining nozzle at the inlet end of the compartment f so that the pressure at the slot or gap 0 at the delivery end of such compartment, which pressure is greater than that at it, cannot obtain access to the combining nozzle at 7% during the working of the injector, while the said'llap n opens when the injector is starting and permits steam to freely escape from the combining nozzle.

The water valve 7) opens into the compartment 9 under the suction action of the jet passing through the combining nozzle 0 to permit of the inflow of a supplementary supply of water to said jet. Such supplementary supply of water acts to cool the jet and reduce the pressure in the compartment f during the working of the apparatus.

In the arrangement shown in Figs. 3 and 4, instead of employing a slot as m (Figs. 1 and 2) in the portion of the combining nozzle in the compartment 9, we employ a flap as r, or, if desired, we may employ a combination of a slot and flap with or without the water inlet controlled by the valve p.

If desired we may arrange the overflow valve 6 to communicate direct with the atmosphere instead of with the common overflow passage it.

Instead of an opening flap as it in the portion of the combining nozzle in the compartment f, we may employ an additional slot or gap 8 as shown in Fig. 5, or a sliding nozzle t as shown in Fig. 6. The said sliding nozzle t is provided with wings a for supporting and guiding it within the extension 0 of the dis charge cone to. The sliding nozzle is also formed with a projecting portion or flange a: adapted, when the nozzle is in the position shown, to seat upon the annular extension 2 of the combining nozzle 0. The action is as follows ;when the injector is starting, the pressure of the steam forces the sliding nozzle 2? towards the discharge end of the injector and so provides a passage between the parts m and y for the free escape of steam and water. When the injector is working normally, the sliding nozzle 6 is forced, by the pressure at the delivery end of the combining nozzle, towards the inlet end of the injector and a joint is thus made between the parts 00 and y, so that the pressure in the chamber f shall not affect the jet passing through the combining nozzle at this point.

we claim as new and desire to ters Patent is;-

1. In injectors, in combination, lifting and forcing steam inlet nozzles. a combining nozzle, co-axial with said lifting and forcing nozzles, an overflow chamber divided into independent compartments surrounding said combining nozzle, comniunicatii1g means between the interior of said combining nozzle at a. point between the ends of said lifting and forcing steam nozzles and the first compartment of the overflow chamber, communicating means between said combining nozzle and the other of said compartments of the overflow chamber, an overflow passage, a valve ay or passage, for each of said (mmpartments, independently communicating with said overflow passage, a free overflow valve in the said valve way or passage of the compartment at the inlet end of the combining nozzle, and a valve automatically loaded during the normal working of the injector in the valve way or passage at the delivery end of the combining nozzle, substantially as set forth.

2. In injectors, in combination, lifting and forcing steam inlet nozzles, a combining nozzle co-axial with said lifting and forcing nozzles, an overflow chamber divided into independent compartments surrounding said combining nozzle, communicating means be tween the interior of said combining nozzle at a point between the ends of said lifting and forcing steam nozzles and the first com partment of the overflow chamber, communicating means between said combining nozzle and the other of said compartments of the overflow chamber, an overflow passage, a valve way or passage, for each of said compartments, independently col'nmunicating with said overflow passage, a discharge chamber to the injector, a free overflow valve in the valve way or passage of the compartment at the inlet end of the combining nozzle and a valve, automatically loaded during the normal working of the injector by the pressure in said discharge chamber, in the valve way or passage of the compartment at the delivery end of the combining nozzle, substantially as set forth.

8. In injectors, in combination, lifting and forcing steam inlet nozzles, a combining nozzle co-axial with said lifting and forcing nozzles, an overflow chamber divided into independent compartments surrounding said combining nozzle, communicating means between the interior of said secure by Letcombining nozzle at a point between the ends of said lifting and forcing steam nozzles and the first compartment of the overflow chamber, communicating means between said combining nozzle and the other of said compartments of the overflow chamber, an overflow passage, a valve way or HEtVlILQ' now described our invention, what i passage, foreach of said compartments, in-

ISO

dependently communicating with said -overflow passa e, a discharge chamber to the injector, a ree overflow valve in the valve way or passage of the compartment at the inlet end of the combining nozzle, a valve, automatically loaded during the normal working of the injector by the pressure in said discharge chamber in the valve way or passage of the compartment at the delivery end of the combining nozzle, and a water inlet valve to the compartment atthe inlet end of the combining nozzle, substan-V tially as set forth. j a

4. In injectors, in combination, lifting and forcing steam inlet nozzles, a combining nozzle co-axialwith said lifting and forcing nozzles, an overflow chamber divided into independent compartments surrounding said combining nozzle, communicating means between the interior of saidcombining nozzle at a point between the ends of said lifting and forcing steam nozzles and the first coma partment of saidoverflow chamber, opening and closing means of communication between theinterior of saidcombiningjnozzle and the inlet end of the other compartment and a gap forming means of communication between the interior of the combining nozzle and the outlet end of said compartment, an

overflow passage, a valve way or passage,

for each of said compartments, independently communicating with said overflow passage, a discharge chamber to the injector, a free overflow valvein the valve way or passage of the compartment at the inlet end of the combining nozzle, a valve, automatically loaded during the normal working of the injector by the pressure in said discharge chamber, in the valve way or passage of the compartment at thedelivery end of the combining nozzle, and a water inlet valve to the compartment at the inlet end of the combiningnozzle, substantially as set'forth. In testimony whereof we aflix our s1gnatnres in presence of two witnesses. JAMES UROXON METCALFE.

' V RICHARD DAVID ME'ICALFE. Witnesses:

EDWARD MARKS, ARTHUR HUGHE. 

